File list (Check if you may need any files):
计算器
......\.classpath
......\.project
......\.settings
......\.........\org.eclipse.jdt.core.prefs
......\bin
......\...\Calculator$1.class
......\...\Calculator$A.class
......\...\Calculator$BackSpace.class
......\...\Calculator$Clear.class
......\...\Calculator$CountDown.class
......\...\Calculator$Opertion.class
......\...\Calculator$Result.class
......\...\Calculator$Strains.class
......\...\Calculator.class
......\...\Calculatormain.class
......\src
......\...\Calculator.java
......\...\Calculatormain.java
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